Rohm OV Instructions De Service page 9

Tightening torques in Nm:
Class M5 M6
8.8 5,5 9,5
10.9 8,1 13
12.9 9,5 16
The threads and head contact surfaces of all securing
screws which are frequently released and retightened
due to their application (e.g. for retooling) must be coa-
ted with a lubricant (grease paste) at six-monthly inter-
vals.
2.8. Clamping devices without permanent pressure supply
During the operation of some clamping devices the
hydraulic or pneumatic supply is turned off. This can
cause a gradual drop in pressure in the active cylinder
chamber. The clamping force can decrease to such an
extent that the workpiece is no longer adequately clam-
ped. To compensate for this pressure drop, the clam-
ping force must be activated for at least 10 seconds
every 10 minutes for reasons of safety.
This is also applicable for prolonged idle periods, for
example if machining is interrupted at night and is not
resumed until the next morning.
3. Environmental Hazards
A wide range of media are required during operation of a
clamping device for lubrication, cooling etc. This are normally
distributed to the clamping device via the distribution housing.
The most common substances used are hydraulic oil, lubrica-
ting oil/grease and cooling agents. When handling the clam-
ping device care must be taken to ensure that these substan-
ces do not come in contact with the soil or water. Warning, en-
vironmental hazard!
This applies in particular
during assembly/disassembly, as residues can be contai-
D
ned in the pipes and piston shafts,
to porous, defective or incorrectly mounted seals,
D
D to lubricants which are emitted or ejected from the clam-
ping device during operation for constructional reasons.
These discharged substances should therefore be collected
and either re-used or disposed of in accordance with valid re-
gulations!
4. Safety requirements for power clamping equipment:
4.1 The machine spindle may not start until the clamping
pressure has been reached in the clamping cylinder
and clamping has been effected within the permissible
working range.
4.2 The pressure may only be released when the machine
spindle is stationary.
Exceptions are only permissible if the complete machi-
ning sequence of loading and unloading is performed
with the spindle in motion and the design of the distri-
butor/cylinder permits this.
4.3 A signal must be emitted to stop the spindle immedia-
tely in the event of a failure of the clamping power.
4.4 The workpiece must remain tightly clamped until the
spindle is stationary in the event of a failure of the
clamping power.
4.5 Changes of the current switch position should not be
possible during an electrical power failure and subse-
quent restoration.
Safety notes
M8 M10 M12
23 46 80
33 65 110
39 78 140
M14 M16 M18
130 190 270
180 270 380
220 330 450
5. Spare Parts
Only use ORIGINAL RÖHM spare parts or components
obtained from authorised RÖHM suppliers. RÖHM GmbH
does not accept any liability for damage resulting from the
employment of parts supplied by other manufacturers.
Note: For simple ordering of spare parts or individual com-
ponents always state the 6-digit ID number engraved on
the assembly and, if available, the works number. This
comprises a letter with two digits and possibly a series
number, stated either on the rating plate or next to the ID
number.
M20 M22 M24
380 510 670
530 720 960
640 860 1120
Nm
Nm
Nm
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